Rotary machine



March 3, 1931. p RENFREW 1,795,040

ROTARY MACHINE Filed July 21. 1927 5 Sheets-Sheet l March 3, 1931. P. B.RENFREW 1,795,040

ROTARY MACHINE Filed July 21 1927 5 Sheets-Sheet 2 March 3, 1931. P. B.RENFREW ROTARY MACHINE Filed July 21. 1927 5 Sheets-Sheet 3 March 3,1931. P. B. RENFREW 4 ROTARY MACHINE Filed July 21. 1927 5 Sheets-Shet 4March 3, 1931. p B RENFREw 1,795,040

ROTARY MACHI NE Filed July 21. 1927 5 SheetsSheet 5 PatentedMar. 3, 1931UNITED STATES PATENT OFFICE PAUL B. RENFBEW, OF FORT WAYNE, INDIANA,ASSIGNOR TO 8. I. BOWSEB & COM- PANY, INC., OF FORT WAYNE, INDIANA,A'GOBPORATION OI INDIANA.

ROTARY MACHINE Application filed July 21, 1927. Serial No. 207,381.

My invention relates to a rotary apparatus which may be operated as apump for effecting the'movem'ent of fluids, liquids and the like, or itmay be driven by steam, air, wateror other fluid as an engine or motor.

In either instance, the general assembly and cooperative relationship ofthe parts will embrace .the same principle of operation so far as itapplies to the salient features of the invention.

The primary object of the invention is to provide an apparatus of theclass described which may be produced at a reasonable manufacturing costtaking into account quiet operation, wear resisting qualities, high efliciency, and a wide range of application.

With these and other objects in view, the description will now proceedwith reference to the accompanying drawings in which I have illustrateda practical embodiment of my invention.

In said drawings Fig. 1 is a view in elevation of the apparatus from oneside;

Fig. 2 is a similar view from the opposite side;

Fig. 3 is a vertical section taken on the line 3-3 of Fig. 2;

Fig. 4 is a vertical sect-ion on the line 44 of Fig. 3, looking in thedirection of the arrows;

Fig. 5 is asimilar view on the same line, looking in the direction ofthe arrows 5 5;

Fig. 6 is a detail perspective view looking as at the inside of thecover and showing the inner rotor carried thereby;

Fig. 7 is a detail perspective view of the two rotors fitted togetherbut removed from their respective housings; and

Fig. 8 is a detail view of a portion of the topedge of the two rotorswith parts thereof broken away.

Referring now to the drawings in detail, the casing for the apparatus ispreferably 43 made in two main parts 5 and 6. The part 6 is hardly morethan a cover although as will hereinafter appear, it not onlyco-operates with the part 5 to enclose some of the operating parts butit also mounts and houses other 63 of the parts. The casing will usuallybe made from a casting suitable for the purpose and having a supportingbase, such as the feet 7, with openings for accommodating bolts or thelike 8, so as to enable the apparatus to be securely anchored upon asupporting structure. Web portions 9 of the castin are provided betweenthe base and the inta e 10 and the outlet 11. Both the intake and outletmay have internally threaded necks 12 for the reception of delivery anddischarge pipes 13. Arranged centrally of the casing in the part 5thereof is a rotor housing 14 for the outer rotor 15 which preferablycomprises a solid machined steel disc-like member having on one side anaxial extension 16 providing a journal bearing. The outer rotor may thusbe journaled for rotation in" its housing upon the non-rotating bearingstud 17. The extension 16 is equipped with a bushing 18 which is securedto such extension 16 and rotates therewith. The stud 17 terminates inthe base of the extension 16 against the closed inner end thereof withits opposite end fixed against rotation in the bore of the sideextension 19 on the part 5 of the casing. A suitable grease cup 20communicates with the axial duct 21 in the stud so that the lubricantmay be supplied to the stud bearing throughout the length of the bushing18 by the radial branching duct 22. In thls respect, the stud is alsoprovided with a circumferential spiral groove 23 for directing thelubricant toward the inner end of the stud as it is supplied through theradial duct 22.

Formed preferably as an integral part of the outer rotor 15 is'a drivinggear 24, the drivin eans for which will be presently describei Thedisc-face 15 of this rotor 15 on the side opposite the gear 24 isequipped with relatively short peripheral vanes 25 which are spacedaround the periphery of the rotor face so that the interdental spacesbetween them provide a multiplicity of openings communicating with theintake 10 and outlet 11 of the casing.

The inside dimension of the intake and outlet is flared inwardly with adecided upward slant so that there is a longer seal between the suctionand discharge at the bottom of the rotor housing than at the top.

The part 6 of the casing has a machined fit with part around the rotorhousing 14 and bolts 26 may be employed to secure the parts together.This part 6 is further made with a central opening 27 for mounting theinner rotor 28 in co-operatin'grelation with the outer rotor buteccentric therewith, as shown in Fig. 6. The inner rotor 28 preferablycomprises a steel machined wheel which projects from the face of thepart 6 and has relatively long radial vanes 29 occupying the interdentalspaces between the vanes of the outer rotor 15 but not' in contacttherewith. The rotor 28 is permanently fixed to the face of a steel disc30 concentric therewith and the opposite side of the disc is equippedwith a driving gear 31, the drive for which will be presently described.The journal bearing for the inner rotor 28 comprises a non-rotating stud32 one end of which is fixed in the bore of a side extension 32' on thepart 6 of the casing with its opposite end projecting into a closed bore28' arranged oo-axial with the rotor 28. A bushing 33 is provided in thebore of the rotor 28 and rotates there- 'with on the stud 32. 'A greasecup 34 is provided for this hearing with a duct arranged as describedwith reference to the bearing for the outer rotor.

Both of the housings for the gears 24 and 31 may be equipped withplugged openings as at 35 and 36 for packing the driving gears withlubricant. The same plugs may be used for draining the gear housings ifdesirable.

Projecting from the face of the central opening 27v at the lower edgethereof is a crescent-shaped brass partition 37. The outer end edges'ofthe vanes 29 on the inner rotor 28 wipe against the concave side of thispartition and the inner end edges of the vanes 25 on the outer rotor 15wipe against the convex side thereof. Since the vanes are steel and thepartition is brass or at least a softer metal than steel, any wear atthis point will be reduced to a minimum. This also applies to the otherpoints of contact between the vanes and casing. For instance, the outerrotor 15 rotates in its housing 14 and the outer edges of the vanesthereof, as well as the circumferential edge of the disc, have a wipingcontact against the inside circumference of the housingbut since thiscontact is steel against brass the wear on the vanes and disc is reducedto a minimum. It should also be pointed out that this insidecircumference between the intake and outlet at the top of the housing isalso ground out to leave a shallow depression 14' onthe radius of theinner rotor 28. The outer edges of the vanes 25 do not contact with theinner circumference of the housing at this space but since it is made onthe radius of the inner rotor the outer edges of the vanes 29 thereofcontact with the circumference at this space and seal the liquid betweenthe vanes at this point. The outer edges of the vanes 25 and the edge ofthe disc thereof contact with the housing throughout the innercircumference thereof excepting this shallow depression, as -explained.The only points of contact for the the casing is a housing 38 for thedriving pinions 39 and 40, one of which is positioned to.

mesh with the driving gear 24 and the other with the gear 31. The driveshaft 41 on which the pinions are mounted enters the casing from theside 5 through a stufiing box 42 with the co-axial opening in the casingparts serving as suitable continuous bearing as at 43 and 44, thebearing 44 being made in the extension of. the plate 45. An intermediatebearing 43' is provided between the pinions 39 and 40 and a lubricatingduct 46 from the cup 47 communicates with the shaft at this hearing. Theshaft, as shown is provided with reversed spiral lubricant channels soas to distribute the lubricant from the duct 46 throughout the length ofthe bearing between the two pinions.

The bearings 43 and 44 are alsoequipped with lubricant cups 48 and 49respectively. The side of the housing 38 for the pinion 40 is covered bya bolted plate 50. The liquid being pumped will occupy the spacesbetween the non-contacting vanes 25 and 29 as it is sucked therein atthe intake 10 and will be trapped in these spaces until released at theoutlet 11. The interdental spaces between the vanes of the inner andouter rotors are presented in confronting relation and the faces of thediscs 15 and 30 thereof lie flush with the sides of the vanes 25 and 29.The diameter of the disc 30 ofthe inner rotor is smaller than that ofthe outer rotor which leaves a crescent-shaped area. on the outer rotoruncovered but this area is covered by the casing 6 which is formed, forthis purpose, with a crescent-shaped flange 6'. As previously stated,the outer edges of the inner rotor contact with the inner circumferenceof the shallow depression 14 between the ends of the crescent-shapedflange 6 which effects a seal at this point.

It is a more or less common expedient to construct rotary pumps, motorsor engines with co-operating rotors but in all of. these prior devicesthe teeth, as they are called, of the rotors are interposed in contactwith one another so that the wear on the same is one of the outstandingdrawbacks. In my improved assembly the. vanes on the respective rotorsoccupy the interdental spaces between the vanes so that they areinterposedwith remon to both.

spect toone another but they do not contact at any point so that wear iseliminated from this cause.

The necessary suction in my assembly is produced from the outside of theouter rims of the rotors. The vanes thereon hold the liquid as well asexpelling it at the proper time. The partitions in the two parts of thecasing seal the housing 38 for the pinions 39 and 40 so that there is nocirculation from the rotor housing into the same.

Another important difference in my assembly over the prior art is thedirect drive for each rotor referably from a shaft comhis enables therotors to be driven in time and relieves the necessity of contact withone another.

In building an apparatus in accordance with my invention, relativediameters of the inner and outer rotors should be taken into account soas to provide for the rotation thereof in proper time. There istherefore considerable significance in the gear ratio used. As anexample, with an inner rotor having 10 vanes the driving pinion for thedrive gear thereof should have 16 teeth with the gear itself having 40teeth. For an outer'rotor with 12 vanes, the driving pinion should have17 teeth with the drive gear having 51 teeth. This ratio would change,of course, when the 10 to 12 ratio of the vanes change. In other words,when the 10 to 12 ratio of the vanes change, the gear ratio should 'bechanged in the same proportion.

A pump or engine constructed in accordance with my invention will .bequiet in operation. There is no chance for the liquid to be trapped bythe vanes and produce hammering. It is unusually efficient in operationand may have a wide range of application. With the wear reduced to aminimum, it will have a long life and the constructionis such as toenable the device to be produced at a reasonable manufacturing cost.

Obviously those skilled in the art may make various changes in thedetails and arrangement of parts without departing from the spirit andscope of the invention as defined by the claims hereto appended and Iwish therefore not to be restricted to the precise construction hereindescribed.

' I claim 1. In a rotary machine of the class described, a casing havingan intake and outlet,

rotors journaled in said casing for rotation in the same direction andeach having spaced radial vanes, the vanes on one rotor occupying theinterdental spaces between the vanes of the other rotor and out ofcontact therewith.

2. A rotary machine of the class described embodying in its constructionco-operating rotors mounted for rotation in the same direction withinterposed vanes out of contact with one another.

embodying in its construction co-operating rotors mounted for rotationin the same direction with interposed vanes out of contact with oneanother, and a direct drive for each rotor from adrive shaft common toboth.

5. A rotary machine of the class described embodying in its constructioninner and outer eccentrically mounted rotors having inter-' posed radialvanes out of contact with one another.

6. A rotary machine of the class described embodying in its constructioninner and outer eccentrically mounted rotors having interposed radialvanes out of contact with one another, and a direct drive for eachrotor.

7 A rotary machine of the class described embodying in its constructioninner and outer eccentrically mounted rotors having interposed radialvanes out of contact with one another, and a direct drive for each rotorfrom a shaft common to both.

8. A rotary machine of the class described embodying in its constructionco-operating rotors mounted for rotation in the same direction withinterposed vanes out of contact with one another, and a direct drive foreach rotor comprising a driving shaft, driving pinions on said shaft,and a gear for each rotor meshing with said pinions.

9. In a rotary machine of the class described, a casing, an outer rotorjournaled therein, an intake and outlet in the casin g on diametricallyopposite sides of said rotor, relatively short radial vanes on the sideof said rotor, an inner rotor eccentrically mounted with respect to theouter rotor, within the space defined by the radial vanes on the outerrotor, relatively long radial vanes on the inner rotor occupying theinterdental spaces between the vanes on the outer rotor but not incontact therewith, a crescent-shaped partition for said rotors betweenthe intake and outlet, and a direct drive for each of said rotors.

10. In a rotary machine of the class described, a casing, an outer rotorjournaled therein, an intake and outlet in the casing on diametricallyopposite sides of said rotor, relatively short radial vanes on the sideof said rotor, an inner rotor eccentrically mounted with res act to theouter rotor, within the space de ned by the radial vanes on the outerrotor, relatively long radial vanes on the inner rotor occupying theinterdental spaces between the vanes on the outerrotor but not incontact therewith, a crescent-sha ed partition for said rotors betweenthe intake and outlet, and a direct drive for each of said a housingcomprising a disc-hke member having relatively short radial vanes on oneside thereof, the other part of said casing comprising a cover for thecentral rotor housing in the first-named part, a rotor 'ournaled in thesaid cover eccentric with sai first-named rotor and having relativelylong radial. vanes occupying the interdental spaces between the variesin said first-named rotor but not in contact with said vanes, acrescent-shaped partition for said rotors between the said intake andoutlet, and a direct drive for each rotor, comprising a drive shaft,driving pinions on said shaft, and a gear for each rotor meshing withsaid pinions.

12. A rotary machine of the class described embodying in itsconstruction a rotor comprising a disc-like member having spacedperipheral vanes on the side thereof, and a co-operating rotor mountedto rotate in the same direction as said first-named rotor and comprisinga wheel-like member eccentrlcally mounted with respect to thefirst-named rotor and having spaced radial vanes occppym the interdentalspaces between said perip eral vanes but out of contact therewith.

13. A rotary machine of the class descnbed embodying in its constructiona rotor comprising a disc-like member having spaced peripheral vanes onthe'side thereof, and a co-operating rotormounted to rotate in the samedirection as said first-named rotor and comprising a wheel-like membereccentrically mounted with res ect to the first-named rotor andhavingspace radial vanes occupym' the interdental spaces between saidperip eral vanes but out of contact therewith, and a direct drive foreach of said rotors.

14. A rotary machine of the class described embodying in itsconstruction a rotor comprising a disc-like member having spacedperipheral vanes on the side thereof, and a co-operatin rotor mounted torotate 1n the samedirectwn as said first-named rotor and comprising awheel-like member eccentrically mounted with respect to the first-namedrotor and having spaced radial vanes occupying the interdental spacesbetween said peripheral vanes but out of contact therewith, and a directdrive for each of said rotors from a drive shaft common to both. v

15. A rotary machine of the class described embodying in its constructmnajrotor comprising a disc-like member havlng spaced peripheral vanes onthe side thereof, and a co-operating rotor mounted to rotate in the samedirection 'as said first-named rotor and rotors ournaled in said casing,and a direct drive for each, of said rotors comprising a drive shaftentering said casing parallel with the axis of rotation of the rotors,pinions on said shaft, one of said pinions being housed in one part ofthe casing and the other being housed in the other part, and-a gear foreach of said rotors entering each of the pinion housings and meshingwith the pinions therein.

17. In a rotary machine of the class described, a casing, a rotorhousing therein, a pair of co-operating rotors journaled in saidhousing, and a direct drive for each of said rotors comprisin a shaft,pinions on the shaft, and a gear or each rotor meshing with"saidpinions, said pinions being each housed in the casing separate fromeach other, and the pinion housings being separated from the housing forthe rotors.

18. A rotary machine of the class described embodying in itsconstruction inner and outer eccentrically mounted rotors j ournaled torotate in the same direction and havin interposed radial vanes out ofcontact with one another.

' 19. A rotary machine of the class described 7 in said casing each forrotation in the same direction, and a series of spaced-apart vanes oneach of said rotors mounted to travel 1n coincident planes, theinterdental spaces between the vanes of one of said rotors being widerand deeper than the vanes of the other rotor.

21. In a rotary machine of the class described, the combination with acasing having an inlet and an outlet, of rotors journaled in said casingeach for rotation in the same direction, a series of spaced-apart vanesat the peripheral portions of each of said rotors, means for supportingsaid'rotors with clearances between the vanes thereof throughout acomplete cycle of rotation, and barriers for closing the clearancebetween the vanes.

22. A rotary machine of the class described compmsing rotors mounted forrotation in the same direction and having radial vanes interspaced withone another, the

spaces between t e vanes of one rotor which are occupied by the vanes ofthe other rotor being wider and deeper than the vanes which thus occupythem to leave clearances between the vanes of one rotor and the vanes ofthe other rotor, and means for closing such clearances at the oppositeperipheral portions of said rotors.

23. A rotary machineof the class described comprising rotors eachmounted for rotation in the same direction and each having a series ofspaced-apart radial vanes inter spaced with the vanes of the otherrotor, the spaces between the vanes of one rotor which are occupied bythe vanes of the other rotor being wider and deeper than the vanes whichoccupy them to leave a clearance between the vanes of one rotor and thevanes of the other rotor, and means for closing such clearances atopposite sides of the periphery of the rotors between the intake andoutlet of the machine.

24. A rotary machine of the class described comprising an outer rotorand an inner rotor each having spaced-apart radial vanes with the vanesof the inner rotor projecting radially beyond the vanes of the outerrotor when occupying predetermined positions, and means comprisingarcuate sealing seats for said vanes between the intake and outlet ofthe machine.

25. A rotary machine comprising a casing having inlet and exhaust ports,rotors j ournaled in said casing, a series of radial vanes on each ofsaid rotors, each of said vanes having fiat faces on the oppositesurfaces thereof,

. and means for supporting said rotors with the vanes thereof out ofcontact with each other at all times.

26. A rotary machine comprising a caslng, rotors therein each havingspaced radial vanes, the vanes on one rotor occupying the interdentalspaces between the vanes on the other rotor, said rotors beingeccentrically mounted to rotate in the same direction, the vanes on onerotor moving into a projected position beyond the periphery of the otherrotor at one stage in the cycle of rotation of the rotors.

27. A rotary machine comprising a casmg, rotors therein each havingspaced radial vanes, the vanes on one rotoroccupymg the interdentalspaces between the vanes on the other rotor, said rotors beingeccentrically mounted to rotate in the same direction, the vanes on onerotor moving into a projected position beyond the periphery of the otherrotor at one stage in the cycle of rotation of the rotors, and acrescent-shaped enlargement in the casing to accommodate the projectedposition of said vanes.

28. A rotary machme comprising a casing having inlet and. outlet ports,a rotor ourrotation of sai nalcd in said casing, a series ofspaced-apart radial vanes on said rotor, another rotor journaled in saidcasing, and a series of spaced-apart vanes on said second-named rotor,said second-named vanes having 0 pcsite plane faces extending from theperip cry of the second-named rotor to a narrow edge extending alon rlines parallel to the axes of rotors.

29. A rotary machine comprising a casing, a rotor journaled for rotationtherein, a series of spaced-apart vanes at the side of said rotor, eachof said vanes being substantially triangular in shape with oppositeplane faces extending to an inner edge parallel to the axis of rotationof said rotor, the interdental spaces between said vanes extending tothe periphery of said rotor, another rotor journaled in said casing forrotation eccentrically of said first-named rotor, a series ofspaced-apart fiat sided radial vanes on said last-named rotor, the sidesof said last-named vanes tapering toward the periphery of thesecond-named rotor, and means for supporting said rotors with the vanesof the secondnamed rotor occupying positions in the interdental spacesbetween the vanes of the first-named rotor but out of contact therewith.

30. A rotary machine comprising a casing, a rotor journaled therein, aseries of substantially triangular vanes at the side of said rotor, theinterdental spaces between said vanes extending to the periphery of saidrotor and said vanes having fiat sides extending to the periphery ofsaid rotorand said vanes having flat sides extending inwardly from theperiphery of the rotor, another rotor in said casing journaled forrotation eccentrically of said firstnamed rotor, flat-sided peripheralvanes on the side of said second-named rotor, and means for supportingsaid rotors with the vanes of the second-named rotor occupying positionsin the interdental spaces between the vanes of the first-named rotorwith the vanes of one rotor being out of contact with the vanes of theother rotor.

31. A rotary machine comprising a casing, a rotor journaled for rotationtherein, a series of spaced-apart substantially triangular vanes at theperipheral portion of said rotor with the interdental spaces betweensaid vanes extending to the periphery of said rotor and said vaneshaving flat opposite sides tapering inwardly, another rotor in saidcasing journaled eccentrically of said first-named rotor, a series ofspacedapart radial vanes on said second-named rotor with opposite flatfaces on each tapering outwardly, the interdental spaces between thevanes of the second-named rotor being wider and deeper than the vanes onthe first-named rotor, and means for supporting said rotors to keep thevanes of one IOU rotor out of contact with the vanes of the other rotorthroughout a complete cycle of rotation of said rotors.

32. A rotary machine comprising a casing having an inlet and an outlet,inner and outer rotors journaled eccentrically of each other in saidcasin a series of spaced-apart radial vanes on eac of said rotors, thevanes of one rotor bein adapted to occupy positions in the inter entalspaces between the vanes of the other rotor, a seat in said casinghaving the form of a segment of a cylinder, and means for supportingsaid rotors in said casing with the vanes of one rotor projectingperipherally beyond the interdental spaces between the vanes of theother rotor to fit against said seat.

33. A rotary machine comprising a casing, a rotor journaled for rotationtherein, a series of spaced-apart vanes on said rotor with theinterdental spaces' between said vanes extending to the periphery of therotor, another rotor journaled in said casing, a series of spaced-apartvanes on said second-named rotor occupying ositions in the interdentalspaces between t e vanes of the first-named rotor, and means forsupporting said second-named rotor with the vanes thereon projectingbeyond the periphery of the first-named rotor when the vanes of saidsecond-named rotor occupy predetermined positions.

34. A rotary machine comprising a casing,

. a rotor journaled therein, a series of spacedapart vanes on said rotorwith the interdental spaces extending to the periphery of said rotor,another rotor in said casing journaled eccentrically of said first-namedrotor, a se- "ries of spaced-apart vanes on said secondnamed rotoroccupying positions in the interdental spaces between the vanes of thefirstnamed rotor but out of contact with the latter throughout acomplete cycle of rotation of the'rotors, and means for supporting saidrotors with the vanes on the second-named rotor projecting beyond theperiphery of the first-named rotor when the "anes on the second-namedrotor occupy predetermined positions in the cycle of rotation of therotors.

35. In a rotary machine, the combination with a casing comprising adetachable cover, of a disc-shaped rotor journaled in said cover, aseries of s aced-apart radial vanes on said rotor exten ing to theperiphery of the latter, another rotor journaled in the casing,

' a series of inwardly extending radial vanes on the peripheral portionof said last-named rotor, a crescent-shaped seat on said cover for thevanes on the second-named rotor, the face of said crescent-shaped seatbeing flush with that side of said first-named rotor adjacent the radialvanes thereon, a crescentshaped partition between the vanes of the tworotors, and a seat between the ends of said crescent-shaped seat for theouter ends of the radial vanes on the first-named rotor.

36. In a rotary machine of the class (lescribed, the combination with acasing having an intake and an outlet, of rotors journaled to rotate insaid casing between said intake and said outlet, radial inter osed vaneson said rotors, a crescent-shape partition in said casing between theintake and outlet and having a curvature corresponding to the curvatureof the periphery of said rotors, the vanes of one of said rotorsprojecting beyond the periphery of the other rotor when in predeterminedpositions in the cycle of'rotation of the rotors, and means forsupporting said rotors with the projecting vanes engaging a cut-awayportion in the casing to serve as a seat diametrically opposite saidcrescent-shaped partition and also located between the intake andoutlet.

37. In a rotary machine of the class described, a casing having anintake and outlet, rotors journaled in said casing between said intakeand outlet, each havin radial interposed vanes in spaced relation troughout a complete cycle of rotation to provide a clearance betweensaid vanes, a crescentshaped partition in said casing between saidintake and outlet and having a curvature corresponding to the curvatureof the periphery of the rotors to close the clearance space between thevanes at the periphery of the rotors at one stage in the cycle ofrotation of the rotors, a crescent shaped enlargement in the casinghaving a curvature substantially corresponding to the curvature of theperiphery of the rotors and positioned diametrically opposed to saidcrescent-shaped partition, the vanes on one of said rotors moving into aprojected position beyond the periphery of the rotors at one stage inthe cycle of rotation of the rotors and adapted to wipe across thesurface of said crescentshaped enlargement for closing the clearancebetween the vanes at another stage in the cycle of rotation of therotors, said crescent-shaped enlargement also being located between saidintake and outlet.

38. In a rotar machine of the class described, a casin aving an intakeand outlet, rotors journale in said casing between said intake andoutlet, each having radial interposed vanes in spaced relationthroughout a complete cycle of rotation to provide a clearance betweensaid vanes, a crescent-shaped partition in said casing, between saidintake and outlet and having a curvature corresponding to the curvatureof the periphery of the rotors to close the clearance space between thevanes at the periphery of the rotors at one stage in the cycle ofrotation of the rotors, a crescent-shaped enlargement in the casinghavingv a curvature substantially corresponding to the curvature of theperiphery of the rotors and positioned diametrically opposed to saidcrescent-shaped partition, the vanes on one of said rotors moving into aprojected position beyond the periphery of t e rotors at one stage inthe cycle of rotation of the rotors and adapted to wipe across thesurface of said crescent-shaped enlargement for closing the clearancebetween the vanes at another sta e in the cycle of rotation of therotors, said crescent-shaped enlargement also being located between saidintake and outlet, said rotors being eccentrically mounted, and aseparate drive for each of said rotors.

39. In a rota machine of the class described, a casing aving an intakeand outlet, rotors journaled in said casing between said intake andoutlet, each having radial interposed vanes in spaced relationthroughout a complete cycle of rotation to provide a clearance betweensaid vanes, a crescent-shaped partition in said casing between saidintake and outlet and having a curvature corresponding to the curvatureof the periphery of the rotors to close the clearance space between thevanes at the periphery of the rotors at one stage in the cycle ofrotation of the rotors, a crescent shaped enlargement in the casinhaving a curvature substantiall corresponding to the curvature of theperip cry of the rotors and positioned diametrically opposed to saidcrescent-shaped partition, the vanes on one of said rotors moving into aprojected position beyond the periphery of the rotors at one stage inthe cycle of rotation of the rotors and adapted to wipe across thesurface of said crescent-shaped enlargement for closing the clearancebetween the vanes at another stage in the cycle of rotation of therotors, said crescent shaped enlargement also being located between saidintake and outlet, said rotors being eccentrically mounted, and aseparate drive for each of said rotors comprising gear teeth on each ofthe rotors, a drive shaft having pinions thereon meshing with the teethof the respective rotors.

40. In a rotar machine of the class described, a casing having an intakeand outlet, rotors journaled in said casing between said intake andoutlet, each having radial interposed vanes in spaced relationthroughout a complete cycle of rotation to provide a clearance betweensaid vanes, a crescent-shaped partition in said casing between saidintake and outlet and having a curvature corresponding to the curvatureof the periphery of the rotors to close the clearance space between thevanes at the periphery of the rotors at one stage in the cycle ofrotation of the rotors, a crescent shaped enlargement in the casinghaving a curvature substantially corresponding to the curvature of theperiphery of the rotors and positioned diametrically opposed to saidcrescent-shaped partition, the vanes on one of said rotors moving into apro ected position beyond the periphery of the rotors at one stage inthe cycle of rotation of the rotors and adapted to wipe across thesurface of said crescent-shaped enlar ement for closing the clearancebetween t e vanes at anot er stage in the c cle of rotation of therotors, said crescent s raped enlargement also being located betweensaid intake and outlet,

said rotors being eccentrically mounted, and

a separate drive for each of said rotors comprising gear teeth on eachof the rotors, a drive shaft having pinions thereon meshing with theteeth of the respective rotors, and means for selectively adjusting thedrive for the rotors for changing their timed relation of rotation.

41. In a rotary machine, the combination with a casing, of a bearingsecured to one of the inner walls of said casin a rotor journaled onsaid bearing, anot er bearing secured to the opposite inner wall of saidcasing, another rotor journaled on said additional bearing, spaced-apartvanes extending from adjacent sides of said rotors and occupyingpositions in coincident planes, and means within said casing andassociated with said vanes for controlling the flow of liquid throughthe machine.

42. In a rotary machine, the combination with a casing, of a fixedbearing secured to one inner wall of said casing, a rotor journaled onsaid bearing, another fixed bearing secured to the opposite inner wallof said casing, an additional rotor journaled on said second-named fixedbearing, spaced-apart vanes on adjacent faces of said rotors incooperative relation to each other while the inner faces of said rotorsare in abutting relation, and means associated with said vanes forcontrolling the flow of liquid through the machine.

43. In a rotary machine, the combination with a casing, of a rotortherein, an annular seat for said rotor, another rotor in said casing,an additional annular seat for said second-named rotor, spaced-apartvanes on said rotors arranged in co-operative relation and with theirdiametral flat faces in contact with the opposite adjacent diametralfaces of said rotors, and means for directing the flow of fluid alongpredetermined paths within said casing.

44. In a rotary machine, the combination with a casing, of a rotortherein having a fiat diametral face, spaced-apart vanes projecting fromsaid fiat face and having flat faces in a diametral plane spaced fromthe firstnamed fiat face, an additional rotor in said casing having afiat diametral face, vanes extending laterally from said additionalrotor and having flat faces in a diametral plane spaced from the flatface of said additional rotor, means for mounting said rotors with theflat faces of the vanes of each in engagement with the flat faces of theopposite rotor, and means for controlling the liquid flow through saidcasing.

45. In a rotary machine, the combination with a. casing havingdetachable sections, of a rotor fitting in a circular recess in onesection, another rotor fitting in a circular recess in the othersection, spaced-apart vanes on each rotor with their flat diametralfaces engaging the fiat diametral faces of the opposite rotor when saidsections are secured together, and means within said casin forcontrolling the flow of the liquid throug the machine.

46. In a rotary pump, the combination with a casing, of two rotorswithin said casing, radial vanes on said rotors, gearing for positivelydriving both rotors with the vanes thereon, and annular seats for therotors to seal the liquid from the gearing.

47. In a rotary pump, the combination with a casin of rotors mountedtherein, annular seats or said rotors, a series of vanes on each rotor,and gearing in enclosed lubricating compartments se arated by saidannular seats from the sai vanes, said gearin being connected to saidrotors to drive sai vanes.

48. In a rotary pump, the combination with a casing having detachablesections, of

a rotor 'fitting in a cylindrical recess in one I section and ournaledto said sectlon, another rotor fitting in a c lindrical recess in theother section and ournaled to said lastnamed sect-ion, spaced-apartradial vanes on g each rotor in co-operative relation when said sectionsare secured together with the adjacent faces of the rotors in enagement, a gear on each rotor, and a pair 0% pinions respectivelymeshing with said gears to drive said rotors and said vanes.

' July, A.

In testimony whereof, have si ned my name to this specification on this16t day of PAUL B. RENFREW.

